Programming Forums > Application Development > Assembly

Klarre · Nov 8th, 2005, 2:41 PM

Where shall I put the value I want to apply the fsqrt instruction on?

int main()
{
	float x = 2.0f;

	_asm
	{
		mov eax, x
		fsqrt          ; Which register does this one use?
		mov x, eax  ; Where is the answear put? eax?
	}

	std::cout << x;
	return 0;
}

As you might guess I want the program to print 1.4142...
But how?

/Klarre

Klarre · Nov 8th, 2005, 3:03 PM

Solved it using this:

(Toggle Plain Text)

	_asm
	{
		fld x
		fsqrt
		fst x
	}

Nov 8th, 2005, 2:41 PM	#1
Klarre Game engine designer Join Date: May 2005 Location: Sweden Posts: 301 Rep Power: 4	[x86]How to use fsqrt Where shall I put the value I want to apply the fsqrt instruction on? (Toggle Plain Text) int main() { float x = 2.0f; _asm { mov eax, x fsqrt ; Which register does this one use? mov x, eax ; Where is the answear put? eax? } std::cout << x; return 0; } int main() { float x = 2.0f; _asm { mov eax, x fsqrt ; Which register does this one use? mov x, eax ; Where is the answear put? eax? } std::cout << x; return 0; } As you might guess I want the program to print 1.4142... But how? /Klarre

Nov 8th, 2005, 3:03 PM	#2
Klarre Game engine designer Join Date: May 2005 Location: Sweden Posts: 301 Rep Power: 4	Solved it using this: (Toggle Plain Text) _asm { fld x fsqrt fst x } _asm { fld x fsqrt fst x }

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Programming Forums > Application Development > Assembly

[x86]How to use fsqrt